lauramarie1186
lauramarie1186 lauramarie1186
  • 23-10-2016
  • Biology
contestada

Until the early _______ there were only negligible amounts of free oxygen in the atmosphere.
A. Cenozoic
B. Mesozoic
C. Proterozoic
D. Precambian

Respuesta :

mudameya mudameya
  • 27-09-2017
Just took the test it's D. proterozoic
Answer Link
brownchina7 brownchina7
  • 27-09-2017
C Proterozoic is the answer I just took the test hope this is very help 
Answer Link

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